Roof collapse of shallow tunnels with limit analysis method
来源期刊：中南大学学报(英文版)2015年第5期
论文作者：YANG Xiao-li LONG Ze-xiang
文章页码：1929 - 1936
Key words：tunnel roofs; nonlinear failure criterion; failure mechanism; kinematical approach
Abstract: A new failure mechanism is proposed to analyze the roof collapse based on nonlinear failure criterion. Limit analysis approach and variational principle are used to obtain analytical findings concerning the stability of potential roof. Then, parametric study is carried out to derive the change rule of corresponding parameters on the influence of collapsing shape, which is of paramount engineering significance to instruct the tunnel excavations. In comparison with existing results, the findings show agreement and validity of the proposed method. The actual collapse in certain shallow tunnels is well in accordance with the proposed failure mechanism.
YANG Xiao-li(杨小礼), LONG Ze-xiang(龙泽祥)
(School of Civil Engineering, Central South University, Changsha 410075, China)
Abstract:A new failure mechanism is proposed to analyze the roof collapse based on nonlinear failure criterion. Limit analysis approach and variational principle are used to obtain analytical findings concerning the stability of potential roof. Then, parametric study is carried out to derive the change rule of corresponding parameters on the influence of collapsing shape, which is of paramount engineering significance to instruct the tunnel excavations. In comparison with existing results, the findings show agreement and validity of the proposed method. The actual collapse in certain shallow tunnels is well in accordance with the proposed failure mechanism.
Key words:tunnel roofs; nonlinear failure criterion; failure mechanism; kinematical approach
